MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

DURING A FACILITY INSPECTION, A TECHNICIAN OBSERVED PRODUCT ON THE GROUND NEAR THE MAINLINE SCRAPER TRAP. OPERATIONS CONTROL WAS NOTIFIED AND PIPELINE SHUTDOWN PROCEDURES WERE IMPLEMENTED. CLEANUP ACTIVITIES WERE INITIATED. IMPACTED SOIL WAS REMOVED AND PROPERLY DISPOSED OF. INVESTIGATION DETERMINED THE LEAK ORIGINATED FROM THE DRA INJECTION LINE. A FAULTY CHECK VALVE ON THE INJECTION LINE ALLOWED CRUDE FROM THE MAINLINE TO FLOW INTO THE INJECTION LINE TO THE RELEASE POINT. A MIXTURE OF DRA AND CRUDE WAS RELEASED. THE DRA INJECTION LINE WAS ISOLATED FROM THE MAINLINE. THE AFFECTED SECTION OF THE LINE WAS REMOVED AND SENT IN FOR FAILURE ANALYSIS. ABOVE-GRADE PIPING WAS INSTALLED TO ALLOW DRA OPERATIONS TO RESUME. RESULTS OF THE METALLURGICAL ANALYSIS INDICATE THE LEAK WAS ATTRIBUTED TO INTERNAL MICROBIOLOGICALLY-INFLUENCED CORROSION (MIC). THE FORMATION OF ACID-PRODUCING BACTERIA (APB) INCREASED WHILE IN CONTACT WITH THE CARBON STEEL PIPE AND RESULTED IN THE PITTING ATTACK AND EVENTUAL PERFORATION OF THE STEEL WALL. STAINLESS STEEL PIPE WAS USED FOR THE ABOVE-GROUND REPLACEMENT SECTION AND THE FAULTY CHECK VALVE WAS REPLACED WITH TWO CHECK VALVES TO PROVIDE REDUNDANCY. 48-HR NRC UPDATE: #1231304, 11:43 11/26/18 SUPPLEMENTAL/FINAL (04/30/2019): PART G1 AND PART H